"supports the creators?" like the person who created the comment gets paid? probably not. I've made zillions of witty upvoted comments and I haven't earned a dime. Where does that money go? Into spez's pockets.
Supposedly you can cash these golds out if you get 10 of them, at a rate of $1 per gold, as long as you live in the US. I figure that the left-most gild is equivalent to 1 gold, so Reddit is keeping roughly 70% of the money you pay through this system.